You should advise him against what he is doing, and stop him from it if he is doing it in front of you. You should weigh the consequences of your actions and attitude so that you can do what draws him closer to the truth.
You should advise him against what he is doing, and stop him from it if he is doing it in front of you. You should weigh the consequences of your actions and attitude so that you can do what draws him closer to the truth.